Visual Composer Licence Key

Hello I am working on a friend’s website and the visual composer doesn’t work. It says it needs a Licence Key. I didn’t build the website. Any thoughts of how I can find it?

You need to purchase the license separately but the problem may be related to something else.
If you’re looking for paid support, I could provide some help. Let me know if you’re interested in

Thanks, I will be in touch if I need any support.